Daewoo Nubira User Manual page 572

Step
7
1. Perform a cylinder compression test.
2. If the compression is low, repair the engine as
needed.
3. Inspect for proper valve timing, bent pushrods,
worn rocker arms, broken or weak valve
springs, and worn camshaft lobes.
4. Inspect the intake manifold and the exhaust
manifold passages for casting flash.
Is the problem found?
8 Repair or replace any components as needed.
Is the repair complete?
9
1. Check the fuel system for a plugged in–line fuel
filter.
2. Check the fuel system for low fuel pressure. If
the fuel pressure is below the value specified,
service the fuel system as needed.
3. Inspect for contaminated fuel.
Is the problem found?
10 Repair or replace any components as needed.
Is the repair complete?
11
1. Disconnect all of the fuel injector harness con-
nectors at the fuel injectors.
2. Connect an injector test light to the harness
terminals of each fuel injector connector.
3. Note the test light while cranking the engine for
each fuel injector.
Does the test light blink for all of the fuel injectors?
12
1. Repair or replace the faulty injector drive circuit
harness, the connector, or the connector termi-
nal.
2. If the harness, the connectors, and the termi-
nals are OK, replace the powertrain control
module (PCM)/engine control module (ECM).
Is the repair complete?
13 Measure the resistance of each fuel injector. The re-
sistance will increase slightly at higher tempera-
tures.
Is the injector resistance within the value specified?
14 Replace any fuel injectors with a resistance that is
out of specifications.
Is the repair complete?
15 Perform an injector balance test.
Is the problem found?
16 Replace any restricted or leaking fuel injectors.
Is the repair complete?
DAEWOO V–121 BL4
Action
ENGINE CONTROLS 1F – 369
Value(s) Yes
Go toStep 8
System OK
41–47 psi Go toStep 10
(284–325 kPa)
System OK
Go toStep 13
System OK
11.6–12.4 Ω
Go toStep 15
System OK
Go toStep 16
System OK
No
Go toStep 9
Go toStep 11
Go toStep 12
Go toStep 14
Go toStep 17